6.3.2 Double-, full-, and membrane-containment tank systemsshall be separated from a fire in an adjacent single- or doublecontainmentimpoundment area such that a fire within theadjacent impoundment or from a design spill will not causeloss of containment. This shall be accomplished by ensuringthat the storage container roof, walls, insulation, or itsimpoundment structure do not reach temperatures at whichmechanical properties of the container roof, wall, insulation, orits impoundment are reduced to levels where the LNG tanksystem, roof, insulation, or impoundment will collapse or burstor product liquid or uncontrolled vapor release will occur. Theapplication of engineering analyses shall be used to determinethis by including the following conditions in the analyses: